US3747767A - Water treatment device - Google Patents

Water treatment device Download PDF

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Publication number
US3747767A
US3747767A US00138628A US3747767DA US3747767A US 3747767 A US3747767 A US 3747767A US 00138628 A US00138628 A US 00138628A US 3747767D A US3747767D A US 3747767DA US 3747767 A US3747767 A US 3747767A
Authority
US
United States
Prior art keywords
shell
plane
ribs
screen
closure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00138628A
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English (en)
Inventor
H Hankammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemie Brita Geraete Ing Karl Itter Nachfolger
Original Assignee
Chemie Brita Geraete Ing Karl Itter Nachfolger
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chemie Brita Geraete Ing Karl Itter Nachfolger filed Critical Chemie Brita Geraete Ing Karl Itter Nachfolger
Application granted granted Critical
Publication of US3747767A publication Critical patent/US3747767A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/28—Strainers not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J47/00—Ion-exchange processes in general; Apparatus therefor
    • B01J47/02—Column or bed processes
    • B01J47/022—Column or bed processes characterised by the construction of the column or container
    • B01J47/024—Column or bed processes characterised by the construction of the column or container where the ion-exchangers are in a removable cartridge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/003—Processes for the treatment of water whereby the filtration technique is of importance using household-type filters for producing potable water, e.g. pitchers, bottles, faucet mounted devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C02F9/20—Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/04—Location of water treatment or water treatment device as part of a pitcher or jug

Definitions

  • the present invention is directed to a device for water treatment by means of a granular cleaning agent and, more particularly, it is specifically directed to the structure of the device containing the granular cleaning agent.
  • Examples of granular cleaning agents not soluble in water and useful in water treatment are adsorbing cleaning agents such as ion exchangers or activated charcoal.
  • the ion exchangers are useful for the demineralization of water, such as is intended for use in bat teries, steam irons and similar purposes where water free of ions is required.
  • Household water such as is used for making tea or coffee, can be dechlorinated by means of activated charcoal.
  • a water treatment device consists of a funnel-shaped part and of a shell which is detachably connected to the funnel-shaped part and has a screen-like closure at each of its ends which retain a granular cleaning agent, not soluble in water, within the shell while permitting the flow of water through the shell.
  • the shell containing the granular cleaning agent is readily exchangeable so that a shell containing ion exchangers for the demineralization of water can be used at one time and then replaced with another shell containing activated charcoal for the dechlorination of water. Further, besides the universal applicability of this device, a shell with fresh cleaning agent can be kept handy for replacing a used shell when it becomes apparent that the useful life of the cleaning agent is finished.
  • the funnel-shaped part is formed of a plastic material which is more elastic than the shell and provides an attachment section with an inwardly extending circular flange against which the shell seats.
  • the shell At its end which fits within the attachment section, the shell has an outwardly directed circular flange which can be pushed into the attachment section so that the flange of the shell forms a circular sealing surface against the inside wall of the attachment section. Further, the flange on the attachment section fits tightly against the outer surface of the shell at its end so that a liquid-tight joint is provided between the two.
  • a tight fit of the shell within the attachment section of the funnel-shaped part is provided with the further advantage of a double-seal which prevents untreated water from bypassing the shell. Moreover, by pushing the shell firmly into the funnel-shaped part it can be easily seated in position for use and, further, it can be readily removed when it is no longer being used.
  • the detachable connection between the shell and the funnel-shaped part can be accomplished in other ways, such as by means of a screw thread or by a bayonet lock,-however, with such connections it is necessary, as a rule, to place sealing means, such as sealing rings, in the connection, which are not required in the preferred embodiment descirbed above.
  • Shells filled with the granular cleaning agent can be marketed as individual replacement items for the water treatment device and the screen-like closures can be integrally attached to each end of the shell.
  • the cleaning agent such as an ion exchanger or activated charcoal
  • the screen-like closure in the end of the shell located within the funnel-shaped part is made removable while at the other end the screen-like closure is formed as an integral part of the shell.
  • the expression screen-like means any structure formed so that the granular cleaning agent is retained within the chamber formed within the shell while water can flow into and out of the chamber in the shell through the closure. Accordingly, the screen-like closures can be formed in a variety of ways, such as perforated plates, slotted plates, screens and the like can be used.
  • the screen-like closures When plastic material is used in forming the shell and its screen-like closures, it is often difficult from a manufacturing point of view to provide the screen-like closures with openings of the desired size. Therefore, it is preferred in constructing the screen-like closures to use concentrically arranged ribs arranged in two planes, one superposed on the other, and with the ribs in the planes staggered relatively to one another so that arcuate slots of a width narrower than the thickness of the granular cleaning agent are provided between the adjacent edges of the ribs.
  • Such ribbed screen-like closures can be molded by using two mold halves having webs which contact each other at the edges and which form the grooves between the ribs of the screen-like closures. Since the edges of the webs of the two mold halves touch each other, then the narrow slots are formed in the screen-like closures between the ribs in the adjacent planes.
  • the ribs in the screen-like closures may be arranged'in a random manner, it is preferable if they are arranged in concentric rings, reinforced by radially extending ribs. Moreover, for production reasons it is also preferable if the cross-section of the ribs forming the screen-like closure taper outwardly from the common center plane to the outwardly spaced surfaces of the ribs.
  • the shell must be provided with a cover for the screen-like closures at each end to assure that the shell is water-tight. It is considered advisable if the shell covers have an identical configuration to simplify production and also to be able, in the event one of the covers becomes lost, to use the remaining cover for the lower end even though it may have been the cover for the lower end which was lost.
  • the shell covers are provided with a circular clamping ring whose inside and outside diameter is dimensioned so that the cover can be clamped inside the upper end of the shell or over the outside of the lower end of the shell. From this arrangment of the covers it can be appreciated that the shell tapers inwardly from its upper to its lower end.
  • FIG. 1 is a vertical sectional view of a water treatment device in accordance with the present invention
  • FIG. 2 is a plan view, on an enlarged scale, of a preferred embodiment of an upper screen-like closure for the device shown in FIG. 1;
  • FIG. 3 is a cross-sectional view of the screen-like closure shown in FIG. 2, taken along line IIIIII.
  • a water treatment device consists of a funnel-shaped part 1 into which a shell 2 is fitted.
  • a tubular attachment section la within which the upper end of the shell seats.
  • the attachment section has an inwardly directed flange 6 which has an inverted L-shape.
  • One leg of the L- shaped flange extends inwardly from the upper part of the attachment section and the other leg extends downwardly in the direction of the shell from the inner end of the inwardly directed leg.
  • An elongated tubular shell 2 is insertable into the funnel-shaped part 1 from the top through its attachment section 1a.
  • the body of the shell 2 tapers or converges inwardly from its upper to its lower end.
  • the shell has an outwardly directed circular flange 5 which is dimensioned so that it can be pushed or forced into the upper part of the attachment section la of the funnel-shaped part 1.
  • the shell In forming the funnel-shaped part 1 and the shell 2, the shell is made of a stiffer material than that of the funnel-shaped part and when the shell is inserted into the funnel-shaped part, due to the difference in stiffnesses of the material, it can be firmly seated within the attachment section la without causing any irreversible deformation of the funnel-shaped part 1. Additionally, the flange 6 on the lower end of the attachment section 1a is dimensioned so that its downwardly depending leg rests in sealing engagement against the outer surface of the shell 2.
  • a pair of annular shaped sealing areas are provided, one between the flange 5 and the inside surface of the upper part of the attachment section la and the other between the lower leg of the flange 6 and the outside surface of the shell 2.
  • a lower screenlike closure is formed as an integral part of the shell 2 while at its opposite upper end a removable screen-like closure 4 having a centrally arranged handle 9 is provided.
  • the handle 9 aids in removing the upper screenlike closure 4.
  • removable covers 7, 8 are provided for each of the lower and upper ends of the shell, respectively.
  • the lower cover 7 fits over the outside of the lower end of the shell while the upper cover 8 seats within the flange 5 about the upper end of the shell.
  • Both of the covers are shaped to provide a water-tight engagement with the ends of the shell.
  • a chamber is formed for granular cleaning agents (not shown in the drawing) which are not soluble in water, such as activated charcoal or ion exchangers.
  • granular cleaning agents such as activated charcoal or ion exchangers.
  • ion exchangers When several different ion exchangers are used within the chamber in the shell at the same time, such as a cation exchanger and an anion exchanger, they can be accommodated within the shell, one layer above the other, separated by a water permeable screen.
  • FIGS. 2 and 3 a preferred embodiment of an upper screen-like closure 4 is illustrated and, as shown clearly in FIG.
  • the screen-like arrangement is formed by a plurality of concentrically arranged ribs 10, 11 with the ribs 11 superposed in a plane above the ribs 10 so that the upper surface of the ribs 10 and the lower surface of the ribs 11 are in substantially the same plane.
  • the ribs are offset or staggered relative to one another in the radial direction so that at the adjoining edges of the ribs 10 and 11 in the common plane between them a narrow spacing is provided form'- ing arcuately shaped slots 12.
  • the upper screen-like closure 4' includes the handle 9 so that the closure can be removed from the shell when it is desired to do so.
  • a plurality of radially extending angularly spaced ribs 13 are provided.
  • the lower screen-like closure 3 is formed in a manner similar to the upper screen-like closure 4, except that the lower closure forms an integral part of the shell since it is molded directly to it.
  • a device for water treatment comprising a tubular shell, a screen-like closure for each of the opposite ends of said shell, said shell and closures forming a chamber arranged to contain a granular agent for treating water, said closures being formed so that the openings there-through are of a size to prevent any displacement of the granular agent from the chamber while permitting passage of water through said closures, said screen-like closures are molded integrally of a plastic material and each comprises a number of ribs in the form of concentric rings disposed in a first plane and another number of ribs in the form of concentric rings disposed in a second plane parallel to and superimposed on the first plane of said ribs so that the lower surface of said ribs in said second plane and the upper surface of said ribs in said first plane are in substantially the same plane, first radially extending ribs located in said first plane interconnecting said concentric ribs in said first plane and second radially extending ribs located in said second plane interconnecting said concentric
  • a device as set forth in claim 1, characterized in that said screen-like closure on one end of said shell being removably secured within said shell, and the other said screen-like closure at the opposite end of said shell being formed as an integral part of said shell.
  • a device as set forth in claim 2, characterized in that a handle is formed on the removable said screenlike closure for assisting in removing said closure from said shell.
  • a device as set forth in claim 3, characterized in that said screen-like closure within the one end of said shell is inset into said shell, a pair of identically shaped covers having an annular shaped clamping rim extending therefrom being arranged to form covers for the opposite ends of said shell, said covers being dimensioned so that one of them can be inserted with its rim extending within said shell into the one end thereof while the other said cover is fitted over the opposite end of said shell so that its rim fits about the outer surface of said shell.
  • a device as set forth in claim 4, characterized in that the walls of said shell tapering inwardly from the one end thereof to the other end.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Combustion & Propulsion (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Water Treatment By Sorption (AREA)
US00138628A 1970-05-13 1971-04-29 Water treatment device Expired - Lifetime US3747767A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7017889U DE7017889U (de) 1970-05-13 1970-05-13 Vorrichtung zur wasserreinigung.

Publications (1)

Publication Number Publication Date
US3747767A true US3747767A (en) 1973-07-24

Family

ID=6611609

Family Applications (1)

Application Number Title Priority Date Filing Date
US00138628A Expired - Lifetime US3747767A (en) 1970-05-13 1971-04-29 Water treatment device

Country Status (9)

Country Link
US (1) US3747767A (ko)
AT (1) AT307333B (ko)
BE (2) BE766967A (ko)
CH (1) CH518238A (ko)
DE (1) DE7017889U (ko)
DK (1) DK152575C (ko)
FR (1) FR2091499A5 (ko)
GB (1) GB1344504A (ko)
NL (2) NL170943C (ko)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107046A (en) * 1975-09-29 1978-08-15 Teledyne Industries, Inc. Water purifier
US4190542A (en) * 1973-07-26 1980-02-26 Smith & Nephew Research Ltd. Disposable column
US4306971A (en) * 1979-05-17 1981-12-22 Chemie Brita Gerate Ing. Karl Itter Nachfolger Water purifying apparatus
DE3430070A1 (de) * 1984-08-16 1986-02-27 Heinz 6204 Taunusstein Hankammer Wasserreinigungsvorrichtung in kompaktformat
US4666600A (en) * 1984-03-17 1987-05-19 Brita Wasserfilter Gmbh Insert for a water purifier
AU612012B2 (en) * 1988-03-26 1991-06-27 Brita Gmbh Water purification device with an intake-funnel
US5322625A (en) * 1988-03-28 1994-06-21 Gerald Rise Filter element for a gravity-flow water filter
US5415774A (en) * 1993-09-02 1995-05-16 Greenland Industries, Inc. Filtration system
US5503740A (en) * 1994-09-20 1996-04-02 Teledyne Industries, Inc. Filter funnel having releasably mounted reservoir
US5811004A (en) * 1996-04-30 1998-09-22 Syratech Corporation Water filtration cartridge
WO1999035091A1 (en) * 1998-01-09 1999-07-15 Recovery Engineering, Inc. Pour-through water treatment carafe
WO2001019733A1 (en) * 1999-09-14 2001-03-22 Windmill Holdings Limited A water filter cartridge
US6238552B1 (en) * 1998-09-04 2001-05-29 Roy T. Shannon Universal insert for a water purifier
US6926821B2 (en) 1997-08-08 2005-08-09 Water Pik, Inc. Water treatment device with volumetric and time monitoring features
US20060231476A1 (en) * 2003-12-03 2006-10-19 Headwaters R & D, Inc. Portable, refillable water dispenser serving batches of water purified of organic and inorganic pollutants
US7326334B2 (en) 2003-10-01 2008-02-05 Instapure Brands, Inc. End-of-faucet filter
US20080164223A1 (en) * 2007-01-05 2008-07-10 Wilson Kelce S Floating filter holder
US20090057241A1 (en) * 2007-08-29 2009-03-05 Phillip Nauta Filter assembly
US20110139700A1 (en) * 2009-12-14 2011-06-16 Hsin-Chi Chu Collection can for precipitated powder substance and the use thereof
US8043502B2 (en) * 2007-08-29 2011-10-25 Uv Corporation Water pitcher filter
US8128820B2 (en) * 2009-02-25 2012-03-06 Mr. Chiaphua Industries Limited UV liquid storage and dispensing device
US20140110325A1 (en) * 2012-10-24 2014-04-24 Paragon Water Systems, Inc. Universal filter cartridge
US20200009482A1 (en) * 2018-07-07 2020-01-09 Paragon Water Systems, Inc. Water filter cartridge having an air vent
US11465919B2 (en) * 2019-05-29 2022-10-11 David K. Farley Conical showerhead and filter

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1132096B (it) * 1980-06-11 1986-06-25 Nuova Faema Spa Metodo per rigenerare,tramite una soluzione salina,il contenuto di resina di una cartuccia di un depuratore dell'acqua per una macchina per il caffe' espresso
DE3248126C2 (de) * 1982-12-24 1991-04-18 Erich 5412 Ransbach-Baumbach Alhäuser Gerät zur Verbesserung der Qualität von Trinkwasser durch Ionenaustausch
DE3475826D1 (en) * 1983-07-18 1989-02-02 Elwatt Srl Improvements in steam generators for use with electrodomestic appliances such as a steam iron
DE3668880D1 (de) * 1986-02-24 1990-03-15 Leifheit Ag Geraet zum filtern von wasser.
DE4024289A1 (de) * 1989-08-01 1991-02-07 Ass Mills Inc Chargenweise arbeitende wasserreinigungskartusche mit schwerkraftzufuehrung und einer mehrzahl von betten
DE102006049084A1 (de) * 2006-10-13 2008-04-17 Bwt Ag Wasseraufbereitungskartusche

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE29394C1 (ko) * 1910-08-27
NL294445A (ko) * 1900-01-01
US1774004A (en) * 1929-04-23 1930-08-26 Haslett Elmer Liquid-treating device
US1883468A (en) * 1930-07-12 1932-10-18 Metropolitan Paving Brick Comp Trickling filter floor construction
BE413218A (ko) * 1936-01-09 1900-01-01
US2690930A (en) * 1950-11-25 1954-10-05 Eve L Corson Water softener dispenser
US2761833A (en) * 1951-12-26 1956-09-04 Samuel I Ward Liquid treating apparatus
US3534856A (en) * 1968-01-25 1970-10-20 Robert E Marsh Valve assembly and self-cleansing brine well screen

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190542A (en) * 1973-07-26 1980-02-26 Smith & Nephew Research Ltd. Disposable column
US4107046A (en) * 1975-09-29 1978-08-15 Teledyne Industries, Inc. Water purifier
US4306971A (en) * 1979-05-17 1981-12-22 Chemie Brita Gerate Ing. Karl Itter Nachfolger Water purifying apparatus
US4666600A (en) * 1984-03-17 1987-05-19 Brita Wasserfilter Gmbh Insert for a water purifier
DE3430070A1 (de) * 1984-08-16 1986-02-27 Heinz 6204 Taunusstein Hankammer Wasserreinigungsvorrichtung in kompaktformat
AU612012B2 (en) * 1988-03-26 1991-06-27 Brita Gmbh Water purification device with an intake-funnel
US5322625A (en) * 1988-03-28 1994-06-21 Gerald Rise Filter element for a gravity-flow water filter
US5415774A (en) * 1993-09-02 1995-05-16 Greenland Industries, Inc. Filtration system
US5503740A (en) * 1994-09-20 1996-04-02 Teledyne Industries, Inc. Filter funnel having releasably mounted reservoir
US5811004A (en) * 1996-04-30 1998-09-22 Syratech Corporation Water filtration cartridge
US6926821B2 (en) 1997-08-08 2005-08-09 Water Pik, Inc. Water treatment device with volumetric and time monitoring features
WO1999035091A1 (en) * 1998-01-09 1999-07-15 Recovery Engineering, Inc. Pour-through water treatment carafe
US6103114A (en) * 1998-01-09 2000-08-15 Recovery Engineering, Inc. Pour-through water treatment carafe
US6238552B1 (en) * 1998-09-04 2001-05-29 Roy T. Shannon Universal insert for a water purifier
WO2001019733A1 (en) * 1999-09-14 2001-03-22 Windmill Holdings Limited A water filter cartridge
US7326334B2 (en) 2003-10-01 2008-02-05 Instapure Brands, Inc. End-of-faucet filter
US7438799B2 (en) * 2003-12-03 2008-10-21 Headwaters R & D, Inc. Portable, refillable water dispenser serving batches of water purified of organic and inorganic pollutants
US20060231476A1 (en) * 2003-12-03 2006-10-19 Headwaters R & D, Inc. Portable, refillable water dispenser serving batches of water purified of organic and inorganic pollutants
US20080164223A1 (en) * 2007-01-05 2008-07-10 Wilson Kelce S Floating filter holder
US7767087B2 (en) * 2007-01-05 2010-08-03 Wilson Kelce S Floating filter holder
US7955501B2 (en) 2007-01-05 2011-06-07 Kelce Steven Wilson Floating filter holder
US20090057241A1 (en) * 2007-08-29 2009-03-05 Phillip Nauta Filter assembly
US8216465B2 (en) 2007-08-29 2012-07-10 Phillip Nauta Filter assembly
US8043502B2 (en) * 2007-08-29 2011-10-25 Uv Corporation Water pitcher filter
US8128820B2 (en) * 2009-02-25 2012-03-06 Mr. Chiaphua Industries Limited UV liquid storage and dispensing device
US8123939B2 (en) * 2009-12-14 2012-02-28 Institute Of Nuclear Energy Research Collection can for precipitated powder substance and the use thereof
US20110139700A1 (en) * 2009-12-14 2011-06-16 Hsin-Chi Chu Collection can for precipitated powder substance and the use thereof
US20140110325A1 (en) * 2012-10-24 2014-04-24 Paragon Water Systems, Inc. Universal filter cartridge
US10669163B2 (en) * 2012-10-24 2020-06-02 Paragon Water Systems Universal filter cartridge
US20200009482A1 (en) * 2018-07-07 2020-01-09 Paragon Water Systems, Inc. Water filter cartridge having an air vent
US11872506B2 (en) * 2018-07-07 2024-01-16 Paragon Water Systems, Inc. Water filter cartridge having an air vent
US11465919B2 (en) * 2019-05-29 2022-10-11 David K. Farley Conical showerhead and filter

Also Published As

Publication number Publication date
CH518238A (de) 1972-01-31
DK152575C (da) 1988-09-12
NL7105743A (ko) 1971-11-16
DE7017889U (de) 1970-08-06
NL170943B (nl) 1982-08-16
GB1344504A (en) 1974-01-23
NL76519C (ko)
BE511365A (ko)
DK152575B (da) 1988-03-21
NL170943C (nl) 1983-01-17
AT307333B (de) 1973-05-25
BE766967A (fr) 1971-10-01
FR2091499A5 (ko) 1972-01-14

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